In the title compound, [Co(C7H4ClO2)2(C5H5N)2(H2O)], the CoII atom is six-coordinated by three O atoms from a bidentate and a monodentate 4-chlorobenzoate ligand, two N atoms from two pyridine ligands and a water O atom, giving a distorted octahedral geometry. In the crystal, the complex molecules are connected by O-HO hydrogen bonds and - interactions between the benzene rings [centroid-centroid distance = 3.8924 (17) Å] into a chain along [010]. Between adjacent chains, - interactions occur between the pyridine rings [centroid-centroid distance = 3.898 (2) Å], giving an overall two-dimensional architecture.

Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: HY2620 ).

Acknowledgements

This work was supported by the Natural Science Foundation of China (No. 21174114), the Plan for the Yangtze River Scholar and Innovation Team Development of the Ministry of Education (No. IRT1177), the Scientific and Technical Plan Project of Gansu Province (No. 1204 GKCA006), the Natural Science Foundation of Gansu Province (No. 1010RJZA024) and the Scientific and Technical Innovation Project of Northwest Normal University (nwnu-kjcxgc-03-63).

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